It's the deck, but also the grass I have here is a stout, broad leafed, dense centipede type creeper, seriously contributing to the issue. (disclaimer: this occurs only when I skip a week, and we get rain almost every day)
I have not experienced any scalping at all, especially in the areas my tractor regularly did. (swale tops)
The exhaust, not radiated muffler heat, does burn the grass if a stop is longer than a minute. I've contacted Flowmaster to construct a dual exhaust to remedy this
Controls are dampened, so they ease back and forth fluidly. Small corrections can make it feel twitchy sometimes, but use experience overcomes that.